The special features of the endothecium of anther of Angiosperm :-

Options

A. Radially elongated cell
B. Thickening of -cellulose
C. Hygroscopic
D. All of the above

Answer

### Step-by-Step Solution:

1. **Definition of Endothecium**:
- The endothecium is the second layer of the anther wall in angiosperms, located beneath the outer layer (the dermis).

2. **Function of Endothecium**:
- The primary function of the endothecium is to assist in the production of pollen grains. It plays a crucial role in the maturation of pollen.

3. **Characteristics of Endothecium**:
- **Radially Elongated Cells**: The cells in the endothecium are radially elongated, which helps in the structural integrity and function of the anther.
- **Thickening of Cellulose**: The endothecium has a thick layer composed of cellulose, which provides strength and support to the anther.
- **Hygroscopic Nature**: The endothecium is hygroscopic, meaning it can absorb moisture from the air. This property is essential for the hydration of pollen grains during their development.

4. **Conclusion**:
- All the mentioned features (radially elongated cells, thickening of cellulose, and hygroscopic nature) are special characteristics of the endothecium in angiosperms. Therefore, the correct answer is "all of the above".